mv64x60_udbg.c
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/*
* udbg serial input/output routines for the Marvell MV64x60 (Discovery).
*
* Author: Dale Farnsworth <dale@farnsworth.org>
*
* 2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <sysdev/mv64x60.h>
#define MPSC_0_CR1_OFFSET 0x000c
#define MPSC_0_CR2_OFFSET 0x0010
#define MPSC_CHR_2_TCS (1 << 9)
#define MPSC_0_CHR_10_OFFSET 0x0030
#define MPSC_INTR_CAUSE_OFF_0 0x0004
#define MPSC_INTR_CAUSE_OFF_1 0x000c
#define MPSC_INTR_CAUSE_RCC (1<<6)
static void __iomem *mpsc_base;
static void __iomem *mpsc_intr_cause;
static void mv64x60_udbg_putc(char c)
{
if (c == '\n')
mv64x60_udbg_putc('\r');
while(in_le32(mpsc_base + MPSC_0_CR2_OFFSET) & MPSC_CHR_2_TCS)
;
out_le32(mpsc_base + MPSC_0_CR1_OFFSET, c);
out_le32(mpsc_base + MPSC_0_CR2_OFFSET, MPSC_CHR_2_TCS);
}
static int mv64x60_udbg_testc(void)
{
return (in_le32(mpsc_intr_cause) & MPSC_INTR_CAUSE_RCC) != 0;
}
static int mv64x60_udbg_getc(void)
{
int cause = 0;
int c;
while (!mv64x60_udbg_testc())
;
c = in_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2);
out_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2, c);
out_le32(mpsc_intr_cause, cause & ~MPSC_INTR_CAUSE_RCC);
return c;
}
static int mv64x60_udbg_getc_poll(void)
{
if (!mv64x60_udbg_testc())
return -1;
return mv64x60_udbg_getc();
}
static void mv64x60_udbg_init(void)
{
struct device_node *np, *mpscintr, *stdout = NULL;
const char *path;
const phandle *ph;
struct resource r[2];
const int *block_index;
int intr_cause_offset;
int err;
path = of_get_property(of_chosen, "linux,stdout-path", NULL);
if (!path)
return;
stdout = of_find_node_by_path(path);
if (!stdout)
return;
for_each_compatible_node(np, "serial", "marvell,mv64360-mpsc") {
if (np == stdout)
break;
}
of_node_put(stdout);
if (!np)
return;
block_index = of_get_property(np, "cell-index", NULL);
if (!block_index)
goto error;
switch (*block_index) {
case 0:
intr_cause_offset = MPSC_INTR_CAUSE_OFF_0;
break;
case 1:
intr_cause_offset = MPSC_INTR_CAUSE_OFF_1;
break;
default:
goto error;
}
err = of_address_to_resource(np, 0, &r[0]);
if (err)
goto error;
ph = of_get_property(np, "mpscintr", NULL);
mpscintr = of_find_node_by_phandle(*ph);
if (!mpscintr)
goto error;
err = of_address_to_resource(mpscintr, 0, &r[1]);
of_node_put(mpscintr);
if (err)
goto error;
of_node_put(np);
mpsc_base = ioremap(r[0].start, resource_size(&r[0]));
if (!mpsc_base)
return;
mpsc_intr_cause = ioremap(r[1].start, resource_size(&r[1]));
if (!mpsc_intr_cause) {
iounmap(mpsc_base);
return;
}
mpsc_intr_cause += intr_cause_offset;
udbg_putc = mv64x60_udbg_putc;
udbg_getc = mv64x60_udbg_getc;
udbg_getc_poll = mv64x60_udbg_getc_poll;
return;
error:
of_node_put(np);
}
void mv64x60_init_early(void)
{
mv64x60_udbg_init();
}